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René Descartes
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(March 31, 1596 – February 11, 1650), also known as Renatus Cartesius (latinized form), was a highly influential French philosopher, mathematician, scientist, and writer.
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Doubt is the origin of wisdom.
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If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.
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All is to be doubted.
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The first precept was never to accept a thing as true until I knew it as such without a single doubt.
Discourse on the Method
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